Zooplankton of the of the Kenga River within the boundaries of the Kenginsky key section of the Vasyugansky State Nature Reserve

In the course of the study, in July 2022, a section of the Kyunga River within the boundaries of the Kyonginsky key area of the Vasyugansky State Nature Reserve was studied. In the course of observations, the number of each species and the structure of the community of the Kyunga River with its tributaries were determined. Six zooplankton species were found in the Kenga River as part of zooplankton: Bosmina longispina (Leydig, 1860), Chydorus sphaericus (Leach, 1816), Cereodaphnia reticulate (Jurine, 1820), Daphnia longispina (O.F. Müller, 1776), Polyphemus pediculus (Linnaeus, 1761) – oar-footed crustaceans: Cyclops sp. The number of zooplankton organisms at all points varies widely from 30 to 860 thousand units/ m3. The dominant occurrence was representatives of the genus Cladocera up to 78.2%, subdominated by the specific occurrence of representatives of Copepoda up to 21.8%. By the number of species, there were Cladocera – 5, Copepoda – 1 species, and Rotatoria were absent, which is likely explained by the river flow, which is fast enough for them. The number of zooplankton organisms at all points varies widely from 30 to 860 thousand units/m3. Representatives of the genus Cladocera were dominant in occurrences up to 78.2%, and representatives of Copepoda were subdominated in specific occurrences up to 21.8%. The value of the Shannon species diversity index as a whole along the Kanga River with tributaries and the Emelich River was 1.46. Such a value of the species diversity index indicates moderate water pollution by organic substances. According to the totality of the data obtained, the Kenga River, with its tributaries, belongs to eutrophic watercourses.

1. Aleksanov V.V., Novikova O.A., Sionova M.N. i dr., Kadastrovye i monitoringovye issledovaniya bioraznoobraziya v Kaluzhskoj oblasti, Tambov, 2021, Issue 8, 148 p. (In Russ.)

2. Savichev O.G. Reki Tomskoj oblasti: sostoyanie, ohrana i ispol'zovanie (Rivers of the Tomsk Region: Status, Protection and Use), Tomsk: Izd-vo TPU, 2003, 170 p.

3. Vomperskij S.E., Sirin A.A., Cyganova O.P. i dr., Izvestiya RAN. Ser. Geogr, 2005, No. 5, pp. 39–50. (In Russ.)

4. Evseeva N.S. Geografiya Tomskoj oblasti: naselenie i hozyajstvo (Geography of the Tomsk Region: Population and Economy), ucheb. Posobie, Tomsk: Izd-vo Tom. un-ta, 2005, 168 p.

5. Resursy poverhnostnyh vod SSSR: Gidrologicheskaya izuchennost'. T. 15: Altaj i Zapadnaya Sibir'. Vyp. 2: Srednyaya Ob' (Surface Water Resources of the USSR: Hydrological Study. Vol. 15: Altai and Western Siberia. Vol. 2: Middle Ob), Leningrad: Gidrometeoizdat, 1967, 351 p.

6. Rylov V.M. Presnovodnye Calanoida SSSR (Freshwater Calanoida USSR), Leningrad: In-t RHPI, 1930, 288 p.

7. Moruzi I.V., Pishchenko E.V., Vesnina L.V. Praktikum po gidrobilogii (Practicum in Hydrobiology), Novosibirsk, 2008, 148 p.

8. Boruckij E.V. Opredelitel' svobodnozhivushchih presnovodnyh veslonogih rakov SSSR i sopredel'nyh stran po fragmentam v kishechnikah ryb (A Guide to Free-Living Freshwater Copepods of the USSR and Neighboring Countries by Fragments in the Intestines of Fish), Moscow: AN SSSR, 1960, 219 p.

9. Boruckij E.V. Opredeliteli organizmov presnyh vod SSSR. Ser. A: Presnovodnaya fauna, Leningrad: Vsesoyuznoe ob"edinenie rybnogo hozyajstva, 1931, 246 p.

10. Kutikova L.A. Kolovratki fauny SSSR (Rotatoria) (Rotifers of the USSR fauna), Leningrad: Nauka, 1970, 744 p.

11. Manujlova E.F. Vetvistousye rachki (Cladocera) fauny SSSR (Crustaceans (Cladocera) of the fauna of the USSR), Moscow; Leningrad: Nauka, 1964, 328 p.

12. Opredelitel' presnovodnyh bespozvonochnyh Rossii i sopredel'nyh territorij. T. 1: Nizshie bespozvonochnye (Guide to freshwater invertebrates of Russia and adjacent territories. Vol. 1: Lower Invertebrates), Saint Petersburg: Zool. in-t RAN, 1994, 396 p.

13. Opredelitel' presnovodnyh bespozvonochnyh evropejskoj chasti SSSR (Guide to Freshwater Invertebrates of the European Part of the USSR), Leningrad: Gidrometeoizdat, 1977, 486 p.

14. Rylov V.M. Fauna SSSR. Rakoobraznye, 1948, Vol. III, Issue 3, 320 p. (In Russ.)

15. Plohinskij N.A. Rukovodstvo po biometrii dlya zootekhnikov (A Guide to Biometrics for Zootechnicians), Moscow: Kolos, 1969, 256 p.

16. Curikov M.N., Curikov S.N., Trudy Associacii osobo ohranyaemyh prirodnyh territorij Central'nogo CHernozem'ya Rossii, Tula, 2001, Issue 4, 130 p. (In Russ.)